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Control strategy of engine with low-pressure exhaust gas recirculation (EGR) system, and vehicle

A control strategy and engine technology, applied in the direction of engine control, engine components, machines/engines, etc., can solve problems such as reducing engine power performance and affecting engine air intake, so as to reduce fuel consumption, improve power performance, and take into account power performance and performance. smoothness effect

Active Publication Date: 2019-12-17
GREAT WALL MOTOR CO LTD
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Problems solved by technology

[0003] In this way, the cooled EGR (exhaust gas recirculation) can suppress knocking when the engine is working under medium and high loads, but when the engine is working under small loads, especially in the external characteristic area, the addition of EGR will affect the engine's performance. Air intake, thereby reducing the power performance of the engine

Method used

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  • Control strategy of engine with low-pressure exhaust gas recirculation (EGR) system, and vehicle
  • Control strategy of engine with low-pressure exhaust gas recirculation (EGR) system, and vehicle
  • Control strategy of engine with low-pressure exhaust gas recirculation (EGR) system, and vehicle

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Embodiment Construction

[0031] Embodiments of the present invention are described in detail below, examples of which are shown in the drawings, wherein the same or similar reference numerals designate the same or similar elements or elements having the same or similar functions throughout. The embodiments described below by referring to the figures are exemplary only for explaining the present invention and should not be construed as limiting the present invention.

[0032] Such as figure 1 As shown, the low-pressure EGR system 100 of the engine with the low-pressure EGR system 100 of the present embodiment first absorbs the exhaust gas by the catalytic converter, and after passing through the supercharger 3, the intake air intercooler 1, the EGR cooler 4 and the throttle valve 6 Only then can it enter the engine cylinder and mix with the oil and gas sprayed out by the injector 2 in the cylinder.

[0033] Among them, the cooled EGR has a certain inhibitory effect on the knocking of the engine when t...

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Abstract

The invention discloses a control strategy of an engine with a low-pressure exhaust gas recirculation (EGR) system, and a vehicle. The control strategy at least comprises the following steps: the rotating speed and torque of the engine are detected; and the opening degree of an EGR valve is determined and adjusted according to the rotating speed and torque of the engine and the EGR rate map, the EGR rate map includes a plurality of areas, and each area corresponds to the specific EGR rate. Thus, when the engine is under different loads and torque, the EGR rate is reasonably adjusted, thus seamless switching among various EGR rate control strategies is achieved, and smooth driving is achieved on the basis of ensuring reducing of fuel consumption of the engine. Therefore, power performance of the vehicle is improved, and the power performance and smoothness of the vehicle are effectively taken into account.

Description

technical field [0001] The invention relates to the technical field of vehicles, in particular to a control strategy of an engine with a low-pressure EGR system and a vehicle. Background technique [0002] In the related art, the engine EGR system is an external EGR, which is to lead the exhaust gas behind the catalytic converter to the intake supercharger, and needs to pass through the supercharger, the intake air intercooler and the throttle valve to enter the engine cylinder. [0003] In this way, the cooled EGR (exhaust gas recirculation) can suppress knocking when the engine is working under medium and high loads, but when the engine is working under small loads, especially in the external characteristic area, the addition of EGR will affect the performance of the engine. intake air, thereby reducing the power performance of the engine. Contents of the invention [0004] The present invention aims to solve at least one of the technical problems existing in the prior ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F02D41/00F02M26/06
CPCF02D41/0077F02D2200/1002F02D2200/101F02M26/06
Inventor 崔亚彬宋东先王立俊常进才马京卫刘亚奇
Owner GREAT WALL MOTOR CO LTD
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